Yeah, most harem anime are just about the same. The Tenchi series probably made this genre so popular in the first place so it's probably one of the only "original" harems out there. Ai Yori Aoshi was just like Love Hina...nothing special college heroes trying to get together with one special girl while the other girls were merely temptations. The character chika was a spitting image of Koalla Su while the main heroine Aoi resembled Shinobu.